empty blocks may range over multiple lines, so it's not enough to jus…

…t reduce by 1 line.

Now virtually collapsing empty labeled blocks will
* reveal diff in line numbers and lead to reasonBlockEndsWithWS
* allow empty labeled blocks at the end of another block (#92)

wsl.go

@@ -1141,7 +1141,7 @@ func (p *Processor) nodeEnd(node ast.Node) int {
 	var line = p.fileSet.Position(node.End()).Line
 
 	if isEmptyLabeledStmt(node) {
-		return line - 1
+		return p.fileSet.Position(node.Pos()).Line
 	}
 
 	return line

wsl_test.go

@@ -66,7 +66,7 @@ func TestGenericHandling(t *testing.T) {
 			}`),
 		},
 		{
-			description: "no false positives for empty labels",
+			description: "no false positives for empty labeled blocks",
 			code: []byte(`package main
 			func main() {
 				goto end;
@@ -208,6 +208,18 @@ func TestShouldRemoveEmptyLines(t *testing.T) {
 				}
 			}`),
 		},
+		{
+			description: "whitespaces parsed correctly in labeled blocks",
+			code: []byte(`package main
+			func main() {
+				goto end
+				end:
+
+			}`),
+			expectedErrorStrings: []string{
+				reasonBlockEndsWithWS,
+			},
+		},
 	}
 
 	for _, tc := range cases {